STRATEGIC PRIORITY: Sustainable
AGENDA DATE: June 25, 2025
COUNCIL DISTRICT(S): 13
DEPARTMENT: Dallas Water Utilities Department
EXECUTIVE: Dev Rastogi
______________________________________________________________________
SUBJECT
Title
Authorize a professional services contract with Halff Associates, Inc. to provide engineering services required for drainage relief improvements to the designated Comprehensive Storm Drainage System Assessment Area 31 - Echo Glen - Not to exceed $1,118,600.00 - Financing: Storm Drainage Management Capital Construction Fund
Body
BACKGROUND
On June 24, 2020, the City Council authorized a professional services contract to complete a Comprehensive Storm Drainage System Assessment (CSDSA) for the City of Dallas. The assessment’s objectives included identifying flood-prone areas and recommending high-priority projects. Forty-seven areas were selected for detailed modeling and alternative analysis. The CSDSA initiative involved extensive collaboration with Dallas Water Utilities Department (DWU) personnel, field reconnaissance, hydrologic and hydraulic assessments, flood mapping, and the conceptual development of alternatives to mitigate the risk of flood-related damages.
Located at the headwaters of the Joe’s Creek Watershed, Project Area 31 - Echo Glen stretches from Interstate Highway 635 (IH-635) to the north and Forest Lane to the south between Welch Road and Haydale Drive. The existing storm sewer system was installed before the current design standards were in place and is inadequately sized. Ninety structures are at risk of flooding by the 100-year storm event with many affected structures categorized as single-family homes. The total inundated area is over eighty acres with depths up to 3.1 feet. Based on the detailed hydraulic model, the existing system has the capacity for less than a two-year storm event.
Project Area 31 was selected by DWU as one of the ten areas to be further developed into a detailed recommendation analysis. Three candidate solutions were considered for evaluation as part of the CSDSA. The goal of the recommended analysis was to develop a conceptual improvement alternative that meets the City’s drainage criteria for storm drainage capacity, while not causing any adverse downstream impacts. From the detailed analysis, a recommended improvement alternative was developed that includes storm drainage infrastructure enhancements at Crestline Avenue, Willow Lane and Willow Ridge Drive, Snow White Drive, Haydale Drive, and Boca Bay Drive as well as detention to attenuate the increases in discharge caused by the storm drainage conveyance improvements.
Given the significance and frequency of flooding in Project Area 31, it is rated as one of the highest priority areas for storm drainage improvements in the city of Dallas and was included in DWU’s Storm Drainage Management Capital Improvement Plan. This action will authorize a professional services contract for the preliminary engineering of storm drainage improvements based on the City of Dallas CSDSA. Engineering services include the development of 15% level design for drainage improvements, analysis of detention alternatives to mitigate downstream impacts associated with the storm-sewer improvements, and evaluation of potential channel improvements and detention along Joe’s Creek from Snow White Drive to Royal Lane. Following completion of preliminary engineering, a future supplemental agreement will be necessary to move forward with final design and associated engineering services.
The services provided for this project include project management, topographic and boundary surveys, environmental services, agency coordination and community outreach, drainage studies including hydrologic and hydraulic stream and storm drain system modeling, and improvement layouts. The consulting firm for this project was selected following a qualifications-based selection process in accordance with the City of Dallas Administrative Directive 4-05 procurement guidelines.
ESTIMATED SCHEDULE OF PROJECT
Begin Services August 2025
Complete Services April 2026
PRIOR ACTION/REVIEW (COUNCIL, BOARDS, COMMISSIONS)
This item has no prior action.
FISCAL INFORMATION
|
Fund |
FY 2025 |
FY 2026 |
Future Years |
|
Storm Drainage Management Capital Construction Fund |
$1,118,600.00 |
$0.00 |
$0.00 |
M/WBE INFORMATION
In accordance with the City’s Business Inclusion and Development Policy adopted on September 23, 2020, by Resolution No. 20-1430, as amended, the M/WBE participation on this contract is as follows:
|
Contract Amount |
Procurement Category |
M/WBE Goal |
|
$1,118,600.00 |
Architecture & Engineering |
34.00% |
|
M/WBE Subcontracting % |
M/WBE Overall % |
M/WBE Overall Participation $ |
|
35.00% |
35.00% |
$391,500.00 |
|
• This contract exceeds the M/WBE goal. |
|
• Halff Associates, Inc. - Local; Workforce - 18.85% Local |
OWNER/EXECUTIVE
Halff Associates, Inc.
Jessica Baker Daily, PE, President
MAP
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